31331322442 has 16 divisors (see below), whose sum is σ = 53713261440. Its totient is φ = 13427103888.

The previous prime is 31331322433. The next prime is 31331322443. The reversal of 31331322442 is 24422313313.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 31331322442.

It is not an unprimeable number, because it can be changed into a prime (31331322443) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 426123 + ... + 494209.

It is an arithmetic number, because the mean of its divisors is an integer number (3357078840).

Almost surely, 2^31331322442 is an apocalyptic number.

31331322442 is a deficient number, since it is larger than the sum of its proper divisors (22381938998).

31331322442 is a wasteful number, since it uses less digits than its factorization.

31331322442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100965.

The product of its digits is 10368, while the sum is 28.

Adding to 31331322442 its reverse (24422313313), we get a palindrome (55753635755).

The spelling of 31331322442 in words is "thirty-one billion, three hundred thirty-one million, three hundred twenty-two thousand, four hundred forty-two".